scholarly journals Mechanistic modeling of fingering, nonmonotonicity, fragmentation, and pulsation within gravity/buoyant destabilized two-phase/unsaturated flow

2003 ◽  
Vol 39 (3) ◽  
Author(s):  
Robert J. Glass ◽  
Lane Yarrington
Keyword(s):  
Unsaturated Flow ◽  
Mechanistic Modeling ◽  
Two Phase

scholarly journals Image-Processing-Based Study of the Interfacial Behavior of the Countercurrent Gas-Liquid Two-Phase Flow in a Hot Leg of a PWR

2012 ◽  
Vol 2012 ◽  
pp. 1-10 ◽  
Author(s):  
Gustavo A. Montoya ◽  
Deendarlianto ◽  
Dirk Lucas ◽  
Thomas Höhne ◽  
Christophe Vallée
Keyword(s):  
Image Processing ◽  
Water Level ◽  
Two Phase Flow ◽  
Fluid Model ◽  
Statistical Treatment ◽  
Mechanistic Modeling ◽  
Image Processing Technique ◽  
Phase Flow ◽  
Interfacial Behavior ◽  
Two Phase

The interfacial behavior during countercurrent two-phase flow of air-water and steam-water in a model of a PWR hot leg was studied quantitatively using digital image processing of a subsequent recorded video images of the experimental series obtained from the TOPFLOW facility,Helmholtz-Zentrum Dresden-Rossendorf e.V.(HZDR), Dresden, Germany. The developed image processing technique provides the transient data of water level inside the hot leg channel up to flooding condition. In this technique, the filters such as median and Gaussian were used to eliminate the drops and the bubbles from the interface and the wall of the test section. A Statistical treatment (average, standard deviation, and probability distribution function (PDF)) of the obtained water level data was carried out also to identify the flow behaviors. The obtained data are characterized by a high resolution in space and time, which makes them suitable for the development and validation of CFD-grade closure models, for example, for two-fluid model. This information is essential also for the development of mechanistic modeling on the relating phenomenon. It was clarified that the local water level at the crest of the hydraulic jump is strongly affected by the liquid properties.

Mechanistic Modeling of Two-Phase Flow in Deviated Wells

2001 ◽  
Vol 16 (03) ◽  
pp. 156-165 ◽  
Author(s):  
A.S. Kaya ◽  
C. Sarica ◽  
J.P. Brill
Keyword(s):  
Two Phase Flow ◽  
Mechanistic Modeling ◽  
Phase Flow ◽  
Two Phase ◽  
Deviated Wells

Mechanistic modeling of flow and heat transfer in vertical upward two-phase slug flows

2022 ◽  
Vol 34 (1) ◽  
pp. 013309
Author(s):  
Chuanshuai Dong ◽  
Ronghui Qi ◽  
Lizhi Zhang
Keyword(s):  
Heat Transfer ◽  
Mechanistic Modeling ◽  
Two Phase ◽  
Flow And Heat Transfer ◽  
Slug Flows

Generation and Size Distribution of Droplet in Annular Two-Phase Flow

1983 ◽  
Vol 105 (2) ◽  
pp. 230-238 ◽  
Author(s):  
Isao Kataoka ◽  
Mamoru Ishii ◽  
Kaichiro Mishima
Keyword(s):  
Experimental Data ◽  
Size Distribution ◽  
Droplet Size ◽  
Annular Flow ◽  
Two Phase Flow ◽  
Mechanistic Modeling ◽  
Dominant Factor ◽  
Phase Flow ◽  
Two Phase ◽  
Detailed Model

The mean droplet size and size distribution are important for detailed mechanistic modeling of annular two-phase flow. A large number of experimental data indicate that the standard Weber number criterion based on the relative velocity between droplets and gas flow predicts far too large droplet sizes. Therefore, it was postulated that the majority of the droplets were generated at the time of entrainment and the size distribution was the direct reflection of the droplet entrainment mechanism based on roll-wave shearing off. A detailed model of the droplet size in annular flow was then developed based on the above assumption. The correlations for the volume mean diameter as well as the size distribution were obtained in collaboration with a large number of experimental data. A comparison with experimental data indicated that indeed the postulated mechanism has been the dominant factor in determining the drop size. Furthermore, a large number of data can be successfully correlated by the present model. These correlations can supply accurate information on droplet size in annular flow which has not been available previously.

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